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Lead exposure in Canada geese of the Eastern Prairie Population

Wildlife Society Bulletin

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Abstract

We monitored lead exposure in Eastern Prairie Population Canada geese during summer-winter, 1986-1987 and 1987-1988 at 5 areas. Blood lead concentrations in geese trapped during summer at Cape Churchill Manitoba were below levels indicative of recent lead exposure (0.18 ppm). Geese exposed to lead (≥0.18 ppm blood lead) increased to 7.6% at Oak Hammock Wildlife Management Area (WMA), southern Manitoba, where lead shot was still in use, and to 10.0% at Roseau River WMA, northern Minnesota, when fall-staging geese were close to a source of lead shot in Manitoba. Proportion of birds exposed to lead dropped to <2% at Lac Qui Parle WMA, Minnesota, a steel shot zone since 1980. On the wintering grounds at Swan Lake National Wildlife Refuge in Missouri, 4.9% of all geese showed exposure to lead before the hunting season. Lead exposure rose to 10.0% after hunting ended and then decreased to 5.2% in late winter. Incidence of lead shot in gizzards and concentrations of lead in livers supported blood assay data. Soil samples indicated that lead shot continues to be available to geese at Swan Lake, even though the area was established as a non-toxic shot zone in 1978. Steel shot zones have reduced lead exposure in the Eastern Prairie Population, but lead shot persists in the environment and continues to account for lead exposure and mortality in Eastern Prairie Population Canada geese.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lead exposure in Canada geese of the Eastern Prairie Population
Series title:
Wildlife Society Bulletin
Volume
19
Issue:
1
Year Published:
1991
Language:
English
Publisher:
The Wildlife Society
Publisher location:
Bethesda, MD
Contributing office(s):
National Wildlife Health Center
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wildlife Society Bulletin
First page:
23
Last page:
32
Country:
United States;Canada
State:
Minnesota, Manitoba
Online Only (Y/N):
N
Additional Online Files(Y/N):
N